Dumbwaiter doorlock



Carried into its normal position by a spring said chamber and has one of its ends secured Patented Aug. 23, 1932 ,UNITED STMESl PATENTOFFICE Application led January 28,` 1931. Serial No. 511,764.

This invention relates to improvements in is vertically moved up and downby means locking devices, particularly to a dumbofits cables l2, l3, inthe usual well known waiter lock, and it is the principal object of manner guided by its ribs 14 in vertical my invention to provide such a lock which guide pieces l5 in the shaft.

5 normally keeps the doors opening into the At each floor of the building the shaft 10 55 dumbwaiter shaft locked and allows an unhas the usual opening lformed inthe wall locking of the same by the operator, only of the dumbwaiter shaft and closed by a when the dumbwaiter is in front of the door 17 door, Near its upper edge on the side of the 10 Another object of my invention is the dumbwaiter shaftthe door carriesja'keeper 60 provision of a dumbwaiter door lock oper- 18, and depending into the opening l'is a ating automatically to unlock the dumbbraoket'l) securedjo the Upper fCe 0f the waiter shaft doors when the dumbwaiter is wall in which opening 16 is formed.

. in front thereof and to lock the same again The lower end of the bracket isforked, as

`-5 when the dumbwaiter is moving away from at 20,` and betweenthe plOIlgS 0f the OIl-i 65 the door. Y is pivotallyattaohed, as at 2l, a finger'k22 A further object of my invention is the adapted to normally engage `with its outer provision of a dumbwaiter door locking deend the keeper 178 andto hold the dumbvice of simple and inexpensive construction, Walter dOfJIlOCked. f j .p `j m yet durable and highly efficient in opera- To the' inner end of finger 22 is pivotally 70 tion, attached, -as at'23, theinnerlend of a lever A still further object of my invention is 24 having a chamberi 25 formed in'its inner the provision of a dumbwaiter door lock, end thIOughWhiCh plVOt pin 23 passes, and the operating end of which is automatically a Spring 26'SV WOuIld abOllSld pin Within in order to engage with its finger a keeper in the side wall of said chamber on one side on the door closing the dumbwaiter shaft of the pin, as at 27, while its other end rests opening. againstlthe other sidewall of the chamber `on These and other objects and advantages of the Opposite side of the pin. ""9 my device will become more fully known as The door 17 is hinged, as at 28, to the 80 the description thereof proceeds and will outer wall of the dumbwaiter shaft and has then be specifically defined in the appended an operating knob 29. Lever l24 has anouterl claims. shoulder 30 formed therewith adapted to en- In the accompanying drawing forming a gagean inner shoulder 31 of finger 22 if i 5 material part of this disclosure: raised by the dumbwaiter top to operate lsaid S5 Fig. l is a fragmentry sectional elevation finger. ,y of a dumbwaiter shaft and dumbwaiter In operation, the lever 24 willv normally therein equipped with a door locking device assume the position shown in Figure 3, in constructed according to my invention. broken lines inclined towards below, with'the l Fig. 2 is a. section on line 2 2 of Figure l. finger 22 engaging the keeper' 18, so that the 90 Fig. 3 is a side elevation of the door lockduinbwaiter ldoor 17 cannot be opened. ing lever partially in section. If the operator is about to collect the gar- Fig. 4 is a bottom plan view of the lockbage or other refuse lie raises the dumbwaiter v ing lever seen in the direction of arrows 4--4 'l1 in fthe usual well known manner, and its i.

4" of Figure 3. upper edge will come into cont-act with the 95 50 of any conventional type, a dumbwater l1 and the same will bedisengaged from its Fig. 5 is a partly sectional front elevation innerl end of lever 24, and elevate the same of the locking lever seen in the direction of into the position shown in Figure 3 in dotted arrows 5--5 of Figure 3. lines inclined towards above so that shoulder As illustrated, in a dumbwaiter shaft 10 30will engageshoulder -31 of the Vfinger 22 M keeper thus allowing an opening of the door. Upon lowering of the dumbwaiter or moving the same to pass door 17 the lever 24 will be forced by its spring again into its position inclined towards the bottom of the shaft so that its finger will again engage keeper 18 and lock the door.

It will be understood that I have described and shown the preferred form of my device only, and that I may make such changes in the construction of my deviceas come within the scope of the appended claims without departure from my invention. Y

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A locking device for the doors of dumbwaiter-shafts, comprising a keeper, a bracket adapted to be secured to al wall of a dumbwaiter shaft, afinger pivoted on said bracket, said finger'normal-ly engaging said keeper to hold the door locked, a spring, and a lever controlled by said spring adapted to be=raised by --the dumbwaiter to disengage said n'ger from said keeper lwhen the dumbwaiter is raised into position in front of the door, said spring automatically engaging the nger with the keeper as soon asthe dumbwaiter ismoved away from the door. p

2. A locking. device for the doors of dumbwaiter-shafts comprising a keeper attached to the inner face of the door, a bracket secured to the dumbwaiter-shaft wall depending into the door opening, a finger pivoted' on said bracket adapted to engage said keeper,` a spring, and an operating lever for said finger controlled by said spring adapted to normally extend into the path of a rising dumbwaiter to disengage saidI finger from its keeper as soon as the lever is displaced bythe rising dumbwaiter, said spring being adapted to guide the lever back into normal position to operate said finger for engaging its keeper.

3. A locking device for the doors` of dumbwaiter-shafts, comprising a bracket having a forked lower end, a finger pivoted between the prongsof said fork, a keeper adapted to be normally engaged by said finger, said automatically engaging said finger with the keeper as soon as the dumbwaiter moves away from the door.

In witness whereof I have signed my name to tliis'specification.

ISIDOR ATTIAS.

finger having-an inner-shoulder,y an operating lever pivoted to said finger having an outer shoulder, and a spring for normally holding said lever in alignment with said finger but allowing an operation of the same upon engagement by a rising dumbwaiter to disengage the finger from its keeper.

4. In a dumbwaiter lock vof the class de- 

